<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<!--css选择器测试-->
		
			<style type="text/css">
		<!--id选择器-->
		#i1{
			background-color: burlywood;
		}
		.c2{
			height: 500px;
			
		}		
			</style>
		
		
		
	</head>
	<body>
		<div class="c1" id="i1">
			<div class="c2">
				
			</div>
			<div class="c2">
				
			</div>
		</div>
		<div class="c1" id="i2"></div>
		<div></div>
		<div></div>
	</body>
</html>
